Engine treatment

This mechanic scam often comes up at oil-change joints, but it’s also at some repair shops and they’re on store shelves too. The pitch is that by adding just a little of the product to the oil, the engine will run like new. Between our own testing and the expertise of some techs, results are mixed. They may not necessarily harm your engine, but the benefits, if any, seem minimal and temporary at best. If the idea is to quiet noisy lifters, for example, you may have bigger issues not to be ignored.